Though researchers have some best guesses, nobody seems to know for sure why exactly a killer whale in Washington state was wearing a dead fish as a hat.

An especially popular killer whale put a dead fish on his head, in a throwback to a fashion last seen in the 1980s.

Researchers recently observed a killer whale (Orca) wearing dead salmon on their heads as hats, and believe it or not it's not the first time. It's something that the Orcas were doing back in the 1980s.